Looking for a good anti-virus, a system optimizer, or maybe an alternative to Photoshop? You'll find all that and more listed below! We've done our best to make sure these things are FREE - or close to it!

Anti-Malware

Malwarebytes (advanced malware detection)

Anti-Spyware

SUPERAntiSpyware (advanced spyware detection)

Anti-Virus

avast! (the free home version)
Microsoft Security Essentials (another free antivirus)
HouseCall (free online virus scanner from Trend Micro)

Archiving

WinRAR (easy to use, lightweight, and flexible all-in-one archiving solution)
7-Zip (can also create TAR and GZ archives)

Audio Editing

Audacity (free, cross-platform sound recorder and editor)

Clip Art

Microsoft Office Online (royalty free collection)

Codecs

Klite

Email

Gmail (from Google)
Hotmail

Gaming

Albino Blacksheep
Addicting Games

Image Manipulation

GIMP (cross-platform Photoshop alternative)
IrfanView (another free image viewer and editor)

Instant Messaging

Digsby (multiprotocol IM - AIM, MSN, Yahoo, ICQ, Google Talk, and Jabber - an email notification tool, and a social networking tool in one easy to use application)
Trillian (lets you connect to multiple IM and social networks at the same time - works for Windows, iPhone, and the Web)

Maintenance and Optimization

Dial-a-fix (compilation of known fixes to resolve Windows XP problems)
CCleaner (freeware system optimization, privacy and cleaning tool)

Music

Pandora (personalized internet radio service that helps you find new music based on your old and current favorites)
gomusicnow.com (songs starting at $0.09 each)

Office

OpenOffice (open-source office software suite for word processing, spreadsheets, presentations, graphics, databases and more)
Evolution (alternative to Outlook)

Online Backup

ADrive (FREE 50GB online storage, cloud storage, upload and store files, access files anywhere, share files, edit documents online, FTP, ADrive Desktop)
Mozy (protect your music, photos, and other computer files with Mozy. 2GB free, unlimited $4.95 a month)

Online Storage

Drop Box

PDF

Foxit (view, print and annotate any PDF)
PrimoPDF (create PDF files from any file you can print, including Word, Excel, and PowerPoint)

Remote Desktop

LogMeIn (free version)

TV

Hulu (free online video service that offers hit TV shows, movies and clips)

Uninstallers

Revo

VoIP

Skype
MagicJack (plug the magicJack into your computer, plug in your phone, and start making phone calls)